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<li class="navelem"><a class="el" href="namespacerttr.html">rttr</a></li><li class="navelem"><a class="el" href="structrttr_1_1policy.html">policy</a></li><li class="navelem"><a class="el" href="structrttr_1_1policy_1_1meth.html">meth</a></li> </ul>
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<a href="#pub-static-attribs">Static Public Attributes</a> |
<a href="structrttr_1_1policy_1_1meth-members.html">List of all members</a> </div>
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<div class="title">rttr::policy::meth Struct Reference</div> </div>
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<p>The <a class="el" href="structrttr_1_1policy_1_1meth.html">meth</a> class groups all policies that can be used during registration of methods.
<a href="structrttr_1_1policy_1_1meth.html#details">More...</a></p>
<p><code>#include <<a class="el" href="policy_8h_source.html">policy.h</a>></code></p>
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Static Public Attributes</h2></td></tr>
<tr class="memitem:a1797eaaddcd48aa0de8edd79ea9070f9"><td class="memItemLeft" align="right" valign="top">static const detail::discard_return </td><td class="memItemRight" valign="bottom"><a class="el" href="structrttr_1_1policy_1_1meth.html#a1797eaaddcd48aa0de8edd79ea9070f9">discard_return</a></td></tr>
<tr class="memdesc:a1797eaaddcd48aa0de8edd79ea9070f9"><td class="mdescLeft"> </td><td class="mdescRight">This policy should be used when the return value of a method should not be forwarded to the caller. <a href="#a1797eaaddcd48aa0de8edd79ea9070f9">More...</a><br /></td></tr>
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<tr class="memitem:ad67ab6cccd0eefa54b80a83851105018"><td class="memItemLeft" align="right" valign="top">static const detail::return_as_ptr </td><td class="memItemRight" valign="bottom"><a class="el" href="structrttr_1_1policy_1_1meth.html#ad67ab6cccd0eefa54b80a83851105018">return_ref_as_ptr</a></td></tr>
<tr class="memdesc:ad67ab6cccd0eefa54b80a83851105018"><td class="mdescLeft"> </td><td class="mdescRight">This policy can be used when a method return a reference to an object and the caller should be able to access this object via the returned variant. <a href="#ad67ab6cccd0eefa54b80a83851105018">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The <a class="el" href="structrttr_1_1policy_1_1meth.html">meth</a> class groups all policies that can be used during registration of methods. </p>
</div><h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a1797eaaddcd48aa0de8edd79ea9070f9">◆ </a></span>discard_return</h2>
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<td class="memname">const detail::discard_return rttr::policy::meth::discard_return</td>
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<p>This policy should be used when the return value of a method should not be forwarded to the caller. </p>
<p>For the caller it looks like the method has no return value, the return type will be <em>void</em>.</p>
<p>See following example code: </p><div class="fragment"><div class="line"><span class="keyword">using namespace </span><a class="code" href="namespacerttr.html">rttr</a>;</div><div class="line"><span class="keywordtype">int</span> my_func() { <span class="keywordflow">return</span> 42; }</div><div class="line"></div><div class="line"><a class="code" href="registration_8h.html#ac6326400f16225ee15b52eabcaae8130">RTTR_REGISTRATION</a></div><div class="line">{</div><div class="line"> <a class="code" href="classrttr_1_1registration.html#a5da1c6eb947d700681faa7fec0bf23b7">registration::method</a>(<span class="stringliteral">"my_func"</span>, &my_func)</div><div class="line"> (</div><div class="line"> <a class="code" href="structrttr_1_1policy_1_1meth.html#a1797eaaddcd48aa0de8edd79ea9070f9">policy::meth::discard_return</a></div><div class="line"> );</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line"> <a class="code" href="classrttr_1_1method.html">method</a> meth = <a class="code" href="classrttr_1_1type.html#a15fa4ae4fb0619be68c3b83967fefb51">type::get_global_method</a>(<span class="stringliteral">"my_func"</span>);</div><div class="line"> std::cout << meth.<a class="code" href="classrttr_1_1method.html#a6664f371e32d239c5dfdc7abdcf9ba53">get_return_type</a>().<a class="code" href="classrttr_1_1type.html#a16d519457c68429ef2316067d1cf6700">get_name</a>(); <span class="comment">// prints "void"</span></div><div class="line"> <a class="code" href="classrttr_1_1variant.html">variant</a> var = meth.<a class="code" href="classrttr_1_1method.html#aea4351075b4cbe6f2f2b6500cf226f20">invoke</a>(<a class="code" href="classrttr_1_1instance.html">instance</a>());</div><div class="line"> std::cout << var.<a class="code" href="classrttr_1_1variant.html#a8a2fe635a8452ac3a2370589d6fc4bfb">is_type</a><<span class="keywordtype">void</span>>(); <span class="comment">// prints "true"</span></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment -->
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<h2 class="memtitle"><span class="permalink"><a href="#ad67ab6cccd0eefa54b80a83851105018">◆ </a></span>return_ref_as_ptr</h2>
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<td class="memname">const detail::return_as_ptr rttr::policy::meth::return_ref_as_ptr</td>
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<p>This policy can be used when a method return a reference to an object and the caller should be able to access this object via the returned variant. </p>
<p>Reference cannot be copied directly in a variant, therefore it is possible transform the reference to a pointer.</p>
<p>See following example code: </p><div class="fragment"><div class="line">std::string& get_text() { <span class="keyword">static</span> std:<span class="keywordtype">string</span> text(<span class="stringliteral">"hello world"</span>); <span class="keywordflow">return</span> text; }</div><div class="line"></div><div class="line"><a class="code" href="registration_8h.html#ac6326400f16225ee15b52eabcaae8130">RTTR_REGISTRATION</a></div><div class="line">{</div><div class="line"> <a class="code" href="classrttr_1_1registration.html#a5da1c6eb947d700681faa7fec0bf23b7">registration::method</a>(<span class="stringliteral">"get_text"</span>, &get_text)</div><div class="line"> (</div><div class="line"> <a class="code" href="structrttr_1_1policy_1_1meth.html#ad67ab6cccd0eefa54b80a83851105018">policy::meth::return_ref_as_ptr</a></div><div class="line"> );</div><div class="line">}</div><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line"> method meth = <a class="code" href="classrttr_1_1type.html#a15fa4ae4fb0619be68c3b83967fefb51">type::get_global_method</a>(<span class="stringliteral">"get_text"</span>);</div><div class="line"> std::cout << meth.get_return_type().get_name(); <span class="comment">// prints "std::string*"</span></div><div class="line"> variant var = meth.invoke(instance());</div><div class="line"> std::cout << var.<a class="code" href="classrttr_1_1variant.html#a8a2fe635a8452ac3a2370589d6fc4bfb">is_type</a><std::string*>(); <span class="comment">// prints "true"</span></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment -->
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="policy_8h_source.html">policy.h</a></li>
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